To which class of database management systems does Redis belong?

Redis is a NoSQL database, specifically an in-memory key-value store. This means that data is stored in RAM for very fast processing, and the data structure is a key-value pair.

Redis supports various data structures (strings, lists, sets, hashes, etc.) and is often used for caching, session management, message queues, and other tasks where high access speed and scalability are important.